建议结合os相关日志，os监控信息，以及alert上下文，相关trace文件，ash进行判断。

maxuproc参数设置的是多少，发来看下

主机内核参数文件配合swap值检查下。

检查一下swap空间使用情况，还有操作系统允许的最大进程数

看看系统参数和trace文件

df -h df -g
free -m
lsps -a
肯定是OS层面导致的了 查OS

这种问题要赶紧回答，回答慢了你都解决了
Troubleshooting ORA-27300 ORA-27301 ORA-27302 Errors (Doc ID 579365.1)

STATUS 12 - ENOMEM Not enough core / memory
During an exec or a break, the program asked for more memory than the one available by the system. This error also occurs when there are too many segmentation registers which are required for the arrangement of text data or stack segments.